Import Geant4 8.0.0 source tree

source/visualization/OpenGL/src/G4OpenGLImmediateSceneHandler.cc

@@ -21,8 +21,8 @@
 // ********************************************************************
 //
 //
-// $Id: G4OpenGLImmediateSceneHandler.cc,v 1.13 2005/06/02 17:43:46 allison Exp $
-// GEANT4 tag $Name: geant4-07-01 $
+// $Id: G4OpenGLImmediateSceneHandler.cc,v 1.17 2005/09/29 14:27:03 allison Exp $
+// GEANT4 tag $Name: geant4-08-00 $
 //
 // 
 // Andrew Walkden  10th February 1997
@@ -41,19 +41,13 @@
 
 #include "G4OpenGLSceneHandler.hh"
 #include "G4OpenGLViewer.hh"
+#include "G4OpenGLViewerDataStore.hh"
 #include "G4OpenGLTransform3D.hh"
-#include "G4Point3D.hh"
-#include "G4Normal3D.hh"
-#include "G4Transform3D.hh"
-#include "G4Polyline.hh"
-#include "G4Text.hh"
-#include "G4Circle.hh"
-#include "G4Square.hh"
-#include "G4Polyhedron.hh"
-#include "G4VisAttributes.hh"
 
 #include "G4OpenGLImmediateSceneHandler.hh"
 
+#include "G4LogicalVolume.hh"
+
 G4OpenGLImmediateSceneHandler::G4OpenGLImmediateSceneHandler (G4VGraphicsSystem& system,
 						const G4String& name):
 G4OpenGLSceneHandler (system, fSceneIdCount++, name)
@@ -111,6 +105,40 @@ void G4OpenGLImmediateSceneHandler::ClearTransientStore () {
   }
 }
 
+void G4OpenGLImmediateSceneHandler::RequestPrimitives (const G4VSolid& solid) {
+  if (fReadyForTransients) {
+    // Always draw transient solids, e.g., hits represented as solids.
+    // (As we have no control over the order of drawing of transient
+    // objects, we cannot do anything about transparent ones, as
+    // below, so always draw them.)
+    G4VSceneHandler::RequestPrimitives (solid);
+  }
+  else {
+    // For non-transient (run-duration) objects, ensure transparent
+    // objects are drawn last.  The problem of
+    // blending/transparency/alpha is quite a tricky one - see History
+    // of opengl-V07-01-01/2/3.
+    // Get vis attributes - pick up defaults if none.
+    const G4VisAttributes* pVA =
+      fpViewer -> GetApplicableVisAttributes(fpVisAttribs);
+    const G4Colour& c = pVA -> GetColour ();
+    G4double opacity = c.GetAlpha ();
+    if (!fSecondPass) {
+      G4bool transparency_enabled =
+	G4OpenGLViewerDataStore::GetTransparencyEnabled(fpViewer);
+      if (transparency_enabled && opacity < 1.) {
+	// On first pass, transparent objects are not drawn, but flag is set...
+	fSecondPassRequested = true;
+	return;
+      }
+    }
+    // On second pass, opaque objects are not drwan...
+    if (fSecondPass && opacity >= 1.) return;
+    // Else invoke base class method...
+    G4VSceneHandler::RequestPrimitives (solid);
+  }
+}
+
 G4int G4OpenGLImmediateSceneHandler::fSceneIdCount = 0;
 
 #endif